Grinding machine



Jan. 29, 1924. 1,482,296

- J. GOULDBOURN ET AL GRINDING MACHINE Filed Aug. 8, 1921 2 Sheets-$heet 1 Jan. 29 1924- J. GOULDBOURN E f AL GRINDING MACHINE Filed Aug. 8, 1921 2 Sheets-$heet 2 Patented Jan. 29, 1924.

g pairs sraras JOSEPH GOULIDBOURN AND FRED RICKS,

E F i Q if.

OF LEICESTER, ENGLAND, ASSIGNORS TO rarest UNITED SH OE MACHINERY COREDB-AIION, OI? PATERSON, NEW JERSEY, A COE- PORflTION OF NEVT JERSEY,

err-moms MACHINE.

Application filed. August 8, 1921. Serial No. 490,524.

To all whom it may concern Be it known that we,"JosErH GoULDsoURN and FRED Rrons, subjects of the King of England. and residing at Leicester, Leicestershire, England, have invented certain Improvements in Grinding Machines, of

ing the cutting blades of a nailing machine.

In machines of the type known as taper nail tacking machines, an example of which is shown in United States Letters Patent No.

490,625, granted Jan. 24,1893, on anapp-licationo'f L. Goddu, there are two shearing blades which cut fasteners from a strip of metal stock. The blades are formed of plates, the cutting edges'of which are substantially radial to and'extend 'between'concentrically curved opposite edges of the plates. One blade in the machine is stationary and considerably thicker'than the other blade which is movable. The cutting edges of the two plates of a pair differ someof the movable" blade about the center, of itscurved edges, thestrip from which the fasteneris to be formed has a portion severed from it by a scissor-like action. This dissimilarity of the blades has heretofore led to some difliculties and uncertainty in their grinding.

An object offthe invention is to provide i a machine for accurate and easy grindingof dissimilar blades such as these without likelihood of error. As a feature of the invention, there is provided, in'the illustrated construction, a support for either of the two blades of a pair, common meansto locat-e similar parts of either blade at a definite point on the support, and a further 10- eating means constraining other parts of the blades to take up necessarily different positions with relation to this support so that each blade will be presented to the grinder in the appropriate position for accurately-and differentially girinding that blade.

- Another feature oft-he inventionrelates what in inclination so that upon movement ed on th'e'upper end of the arm moved across the face of the rinding wheel,

to an improved construction by which the extent and accuracy of the grindlng is indicated. As shown, there is provided a movable blade support, means associated with the support for locating the blade in the proper position for securing the desired angle of ground edge with relation to the body of the blade, a grinder, a gage'to indicate when the edge of the blade has been correctly ground, and means controlled by the movement of the support between operative and inoperative grinding positions, for

moving the gage into and out of llldlCfit-.

ing position.

Other ob ects and advantages of'the inventlon Wlll appear from a consideration of the following specification and accompanying drawings, in which- Fig. 1 is a front view of the grinding device;

Fig. 2 is a plan view showing the tool support out of grinding position and the gauge operative to indicate the completion.

of grinding;

Fig. 3 is a plan view showing the sup port moved up toward the wheel; and

Fig. 4: is'a side elevation of a modified form of' the .mechanism for operating the gage.

In this construction a grinding wheel 2, shaped as a disk with a cylindrical periph- "eral rim, is fixed on one end of a horizontal shaft which is rotatably mounted in suitable bearings formed on a frame 4. Fixed in the frame 4 of the machine parallel to but below and in front of the grinding wheel shaft is a fixed horizontal shaft 6 which has mounted on it a vertically disposed arm 8. The arm is arranged to be rocked by hand on the fixed shaft between limit stops formedby depending lugs 10 on the hub of the arm 8 and a'horizontal pin 1.2 positioned between the lugs and exexemplified by the hand wheel 16. Rotation of the hand wheel 16 moves the hub 14 axially of the shaft 6 carrying the arm 8 with it. The manual rocking or swinging inovem'entcauses the blade or cutter (which as will hereinafter be described, is SUPPOIgD to e V 'the blade is positioned.

and movement of the arm Salong the shaft 6 adjusts the blade towards this face of the grinding wheel in a direction parallel to the rim.

The arm :8 at its upper end is formed as a table or support 20 the upper face of which is inclined downwardly towards the face of the grinding wheel so that the edge of the blade is backed off at the desired angle The upper face of the table 20 has fixed in it two pins or abutments 22, 24 perpendicular to the face, against which the concave s1de of The pin which engages the blade nearest the cutting edge is a plain cylindrical pin and the other, is a fixed abutment of irregular shape hav ng a cylindrical head of larger diameter than but coaxial with its cylindrical shank 2.6 and the head is raised a. su'tlicient distance above the table to allow of the thinner of the two blades, usu'al'in the type of machine .described in the specification above referred to,

i. e. the moving one, only just passing under the head 24 and being positioned against the shank 26, as shown in the drawings. The-thicker of the two blades is positioned against the head and is usually bevelled off as shown by the face 28 in Fig. 1 so as to reduce to a minimum the amount of grinding required upon the end face 30 of which the lower edge is the cutting edge. The necessity for the different positioning of the two blades, in relation to the pin 22 against 'which both in turn res-t, arises from the fact that the cutting edge of thethick or stationary blade is radial tothe center of curvature of the concave side of the blade while the cutting edge of the thin blade is on a line which, ifprojected, would pass to one side of that center. It will be observed, then, that the two types of blades have similarly shaped bodies, differently dis-posed cutting edges, and another varying characteristie, here, their thickness The blade is clamped in position against the pins 22, 24 by a block 32 engaging the convex side of the blade, which block is slidingly mounted in a groove more or less radial to the cutters and formed in the upper face of th table. The block has a recess in which is positioned an eccentric 34 formed on a hand lever 36. The hand lever is rotatably mounted on a pin 38 passing through the table 20 and a. slot in the block.

I A pin 3,9 projecting upwardly from the table limits the movement of the hand lever in its cutter releasing movement.

A gauge face 40 by which the operator may determine when either of the blades 0nd arm 48 which has rotatably mounted on its end a depending pin 50 the upper end of which has fixed on it a collar and the lower end of which is connected by a transverse pivot 52 to one end of a rod54. The other end of the rod 54 passes through an extension 56 of the frame of the machine and has on its end a compression spring 58 which is confined between the back of the extension 56 and a collar 60 fixed on the end of the rod. On the side of the extension remote from the spring the rod 54 has formed on it blade arrying arm, the arm 48 is therefore turned on its axis and the gauge arm 42 is swung outwardly away from the blade intoa position (shown Fig. .3) in which it does not obstruct the movement of the blade on to and across the grinding wheel. When the blade .carryingarm is swung in the reverse direction the gauge arm will swing towards the blade and during the last portion of such movement, when the blade quite clear of. the grinding wheel, the spring 58 will be slight .y compressed thereby ensuring full movement of the gauge arm towards the blade. The gauge carm42 is limited in its movement towardsthe blade by the engagement of a hemispherically end ed pm 64 on the gauge arm with a flat faced stop .66 on the table 20.

Instead of the mechanism above described for movmg the gauge, there may be provided to operate the arm 42 a fixed cam piece 70- .(Fig. 4) fast on the front part of the frame 4 and acting directly on a ball 7 2 depending from the arm 48 to cam the ari'n 48' away from the blade in the first portion of the movement of the table arm 8 towards the grinding wheel, there being a spring 74 coiled about the shaft 44 (bearing at one end on the arm 42 and at the other end on the arm 8) to ITIOVBlZhG arm 42 towards the blade, near the end of the return movement of the arm 8 away from the grinding wheel when the ball 72 reaches the drop in the cam. 7

Referring to Fig. 3, the parts are shown in blade to be ground, the arm 8 has been backed away from the grinding wheel" along the shaft 6 and the blade (shown dotted) has its edge worn so as to project farther over the edge of the table 20 at the convex side of the cutter than at the concave side. The cutting edge requires to be ground until-it is parallel with the table edge along 7 the whole length of cutting edge. The op- .a position in which, in order to allow a worn erator will therefore swing the arm 8 backwards and forwards on the shaft 6,-that is, towards and away from an observer of Fig. 1, so that the blade moves across the grind ing wheel rim;- meantime he will gradually move the arm along the shaft 6 by means of the hand wheel 16, and also will occasionally move the arm through a larger are clear of the grinding wheel to the position shown in Fig. 2 so as to bring the gauge face 40 up to the cutting edge so thathe may observe what further grinding is required. The simultaneous engagement of the pin 64 and the stop 66 and the engagement of the cuttingedge along its whole'length with the gauge face 40 indicates that the blade (either the fixed or stationary one) has been correctly ground.

Having thus described our invention, what we claim as new and desire to secure by Letters Patent of the United States is:

1. In a machine of the class described, a grinder, a support for the similar shaped bodies of the tools of a set which vary as to cutting edge and one other characteristic, common means to locate similar parts of the bodies of the tools of a set at a definite point,

and locating means engaging other parts of the similar shaped bodies of said tools, said locating means being arranged to co-operate with the varying characteristic of the tools to cause them to take diflerent positions with relation to the supportwhereby their edges will be ground at different angles.

2. In a machine of the class described, a grinder, a support for difi'ering tools of a set, common means to locate similar parts of the tools of a set at a definite point, and a further locating means engaging other parts of said tools and comprising a member having portions which vary in position with their distances from'the support whereby tools of different thicknesses are differently located forgrinding. V

3. In a machine of the class described, a

grinder, a support for differing toolsof a set, and means for locating the various tools in dilferent positions for grinding comprising an abutment of irregular shape arranged to provide tool supportingsurfaces at difierent distances from the tool support and to cause the varioustools to assume dif- Eerent positions on said support.

4. In a machine of the class described, a

grinder, a support for either of a pair of blades of different thicknesses, a stud projecting from the support for locating similar parts of either of said blades at a definite point, and a further locating means comprising a pin for engagement with the V thinner one of said blades to locate it in a position for grinding, and a head on said pin for engagement with the thicker of said blades to locate it in a different position for grinding.

In a machine of the class described, a grinder, a movable tool support, means for securing a tool -on the support, a gauge to indicate when the edge of the tool has been correctly ground, and means,'controlled by the movement of the tool support between operative and inoperative grinding positions, for moving the gauge into and out of indicating position.

6. In a machine of the class described. a grinder, a movable blade support, means for securing a blade on the support, a gauge movably mounted on the support and ar ranged to engage the edge of the blade, a fixed member, and means connected to the movable gauge and engageable with the fixed member for moving the gauge against the edge of the blade during movement of the blade support to indicate the degree of grinding.

7. Ina machine of the class described, a grinder, a movable blade support, means for securing the blade on the support, a gauge pivoted on the support, and arranged to swing against the edge of the blade, an arm secured to the gauge pivot, a fixed member, and a rod secured to the arm and connected to the fixedmember for swinging the gauge during movement of the blade support.

8. In a machine of the class described, a grinder, a blade support, said grinder and blade support being relatively movable means for securing the blade on the support, a gauge pivoted on the support and arranged to engage the edge of the blade, and means set in operation by said relative movement for swinging the gauge to a position where it will indicate the degree of grinding.

9. In a machine of the class described, a grinder, a blade support, means for securing the blade on the support, a gauge pivoted on the support, means for swinging the gauge against the edge of the blade and means carried by the gauge for engagement with the blade sup ort to indicate the completion of the grin ing.

10. In a machine of the class described, a grinder, a movable blade support, means for securing the blade to the support, a gauge pivoted on the support and arranged to engage the edge of the blade, means operated by the movement of the blade support for swinging the gauge out of operative position and a spring tending to swing the gauge against the blade.

11. In a machine of the class described, a grinder, a support for a blade, means for locating the blade on the support for grind ing, and means for both moving the blade against the locating means and clamping it in position.

' 12. In a machine for grindin the different blades of a set, a grinder, a lolade support, means for locating the blades difit'ersired angle of gronnd edge in relation to the body of the blade, and a clamp to hold either of the blades against said locating means in correct position on the support for grinding.

13. In a machine for grinding the different blades of a set, a grinder, a sup. aort for the blades of differing form, and a Xed abutment constructed and arranged to cause the edges of the diltering blades to select a common grinding station on the support while the shape of the abutment forces the bodies of the blades to occupy dilierent po- 7 sitions in ZLCCOI'ClHIlCB with their differences in form.

engage the blade, a spring connected to thegauge and to the support for holding the gauge againstthe blade, and means movable with the support and operating by contact with a lixed member for 'moving the gauge away from the blade against the tens'1on of said sprung In testimony whereof we have signed our names to this specification. r

JOSEPH GOULDBOURN.

FRED RICKS. 

